Combined collar buster and casing spear



May 10, 1927.

P. DIETRICH COMBINED COLLAR BUSTER AND CASING SPEAR 2 Sheets-Sheet 1 Filed Sept. 16, 1924.

May 19275 P. DlETRlCH COMBINED COLLAR BUSTER AND CASING SPEAR Filed Sept. 16, 1924 2 Sheets-Sheet 2 i Z P 9 Patented May 10, 1927.

UNITED STATES PATENT OFFICE.

PAUL DIETRIGH, OF APPE'RSON, OKLAHOMA.

connmnn COLLAR} nusran AND casme srnan.

: Application filed September 16,1924. Serial no. 738,099.

, L'Ihe present invention relates to deep well tools and more part cularly to a casing tool whereby the same may be cut when required er jarred back into place when partly withn drawn. said tool being constructed to slip over the main ,pipe passing through the ca".- ing thereby. preventing the tool from sticking in the well. and causing trouble when removing the casing.

The invention furthermore provides a ftool which will operate equally well upon being jarred upwardly or downwardly when cuttingaicollar to dmit of the casing being removeel in sections, said tool also oploerating effectively as a casing spear when 2 of the invention is understood.

it is required to jar the, casing back to place forming a part of the specification,

Figure 1 is a. vertical central sectional View of a combined well tool embodying the invention showing the same adapted for 'use as a casing s ear, the casing being.

shown in section an the small pipe passing therethrough in full lines,

Figure 2 is a front elevational view of the tool as adapted for use as a-casing spear, I Fi ure 3 is a view similar to Flgure 1 showing the tool adapted for use as a collar buster, the full lines showing the bit operatively. arranged for a downward jar of-the tool, and the dotted lines indicating the position of the bit when the tool is adapted for operative use by an upward jar, Figure 4 is a horizontal sectional view on tmi iine 44' of Figure 1,

1 1 the l ne 5.5 ofFi re 1, and

Figure6 is a, horlzontalsection 1 view on the line 6-6-of Figure 3. S

Corresponding and like partsa ereferred.

I to in the following-description and designated in the several views of the drawings by'hke reference characters. 1

The numeral 10 designates the casing or re 5 is a similar sectionalview' on upper enlarged pipe section of. an oil well and 11 the smaller pipe passing therethrough and this casing comprises sections which are coupled by means of a collar 12.

The tool comprisesa tubular body 13 having a shank 14 to which the jarring rod is adapted to be attached in a manner well understood and the opening 15 of the body is of a size to receiigethe smaller pipe 11 of the well so-that the tool-may he slipped thereover when lowered into the well for use as a casing spear or as a collar buster by being jarred upwardly or downwardly. The opening 15 is disposed to one side of the-center of the body whereby to provide a thickened portion 16 in which is formed an opening and cut awayiportions for this A portion of the several operating parts. outer side of the thickened part 16 is cut away as indicated at 17 and its inner wall is inclined as indicated at 18. 'A groove is formed in the bottom of the inclined wall 18 and comprises. enlarged end-portions '19 and 20 and an intermediate constructed portion 21, the side walls of which are undercut to coact with a wedge-shaped rib 22 on the'rear side of a dog 23 whereby the latter is retained within the cut away portion 17 and prevented from casual detachment. The dog 23 is, of wedge form and its rear side is inclined to cgrrespond with and ride upon the inclined wall 18 whereby a longitudinal movement of the dog also results'in a lateral movement thereof. The outerface of the dog 23 is toothed so as to bite into the inner wall of the casing 10 and firmly engage the same when the tool is jarred downwardly to return the casing after being lifted a short distance. An

opening 24' is'formed in the thickened part 16 and communicates at its upper end with the cut away portion 17 and the lower enlarged port-ion 20 of the groove formed in the'bottom thereof. A slot 25 is formed in the outer side of the thickened part 15 and communicates with the opening 24 and is adapted to receive the outer end of a peg 26 and the acti ve portion ofapivoted bit 27.

The'ibit 27 is pivoted at one end to the body 13 as 1 indicated at 28 and maybe arranged to incline outwardly and downwardly as ,indicated by the full 'lines in Figure 3 or upwardly and outwardly as designated by the dotted lines in said figure, the active end of the bit hem tapered to a chisel edgeso as -townta co lar 12 of the is adapted for use as a casing spear the bit.

27 and pivot pin 28 are removed and the dog 23 is placed in position and retained in place by means of a keeper 31 which extends across the upper part of the cut away portion 17 and made fast to the body 13 by machine screws 32 or analogous fastening means. The keeper 31 prevents registering of the wedge-shaped rib 18 with the upper enlarged portion 19 of the groove in the bottom of the cut away portion 17 ivhen the dog 23 is at the limit of its upward movenient. However, when it is requiredto remove the dog 23 the keeper 31 is detached so that when the dog is moved upwardly to bring its rib 22 in register with the enlarged portion 19 of the said groove, the dog may be drawn forwardly and disconnected from the body. r

'A trip 33 is loosely fitted within the opening 24.- and consists of a bar having an enlargement 34 at its lower end to form a stop. and terminating at its upper end about in line with the bottom of the cut away portion 17. This trip or bar 33 is formed with an opening to receive the peg 26 which is adapted tmengage the lower end of the slot 25 and prevent downward displacement of the trip. A slide grip 341 is mounted upon the lower portion of the trip 33 and is upwardly tapered so as to move upwardly freely with the trip and tool but which grips the inner pipe 11 and the casing 10 when the tool and trip are moved downwardly whereby to hold the trip 33 so that it may have a relative upward movement in the opening 24 to engage and move the dog 23 upwardly into operative position so as to initially grip the casing 1i) and operate to lower or return the casing after being limited in its upward movement so that it may be possible to remove the casing by a repeated jarring action before having recourse to the separation thereof into sections by adapting the tool for use as a buster for the collars.

\Vhat is claimed is 2-- A well tool of the character specified comprising an eccentricliore to slip over the inner pipe and having a relatively thick side portioin a shank attachable to a jarring rod and extending from said side portion and disposable between the inner pipe and well casing. said body having a side portion being cut away and the bottom of the cut away portion inclined and provided with a groove having an end portion enlarged and a portion with its opposite walls under out, a dog having a rib to enter the enlarged portion of said groove and engage the under cut portion thereof, and a keeper applied to the hodvito prevent registering of the rib of the (log with the enlarged portion of the said groove to prevent casual displacementof the dog.

In testimony whereof I affix my si nature.

PAUL DIETIi'IoH. 

